ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Pincushion hairy urchin (Tripneustes gratilla) on coral. This sea urchin is also named the collector urchin. It is found on reefs in the tropical Indo- Pacific region from the Red Sea to Hawaii. A sea urchin is a marine echinoderm invertebrate, related to the starfish. Like a starfish it has radial symmetry. Its shell can be thought of as 5 fused arms. Poisonous spines protrude upwards from this shell, while tube feet on its underside are used to crawl over rocks. The mouth underneath has five jaws that scrape up algae growing on the rock surface. This urchin can reach a width of 8 centimetres. Photographed in the Red Sea.
Model release not required. Property release not required.